Headers

Information contained within a newsgroup post identifying the subject of the
article, the newsgroup it was posted to, its author, the date it was created,
the original Usenet server the article was posted to, and the path it has
taken to reach any other servers, among other things. Many
news readers can use the information provided
by a header to manage articles efficiently.
For example, if there is a disruptive user in a newsgroup that you would like
to ignore, your news client can block all articles that contain the
header information identifying that user.